Mr. Penumbra's Twenty-Four Hour Book Store by Robin Sloan
I stumbled across this short story and became completely absorbed (while I should have been working). Anyhow, it's awesome and you need to read it too. Immediately. It's a wildly imaginative and refreshingly original piece about a mysterious bookstore and how ebooks and ereaders are changing more than just the way we read.
There is something to be said about stories written about books/bookstores/book mobiles. They get me every time.
Read Mr. Penumbra's Twenty-Four Hour Book Store in it's entirety for free right here. Now.